问题 解答题

①(23+27)×(77+73)×25.

②19×27+190×5+19×23.

③23×2×24+25×4×2+27×1×8+25×8×1.

④1250×32×25.

答案

①(23+27)×(77+73)×25

=50×150×25

=187500;

②19×27+190×5+19×23

=19×27+19×50+19×23

=19×(27+23+50)

=19×100

=1900;

③23×2×24+25×4×2+27×1×8+25×8×1

=138×8+27×8+25×8+25×8

=(138+27)×8+(25+25)×8

=165×8+50×8

=1320+400

=1720;

④1250×32×25

=(1250×8)×(4×25)

=10000×100

=1000000.

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